Light particles actually move and behave as waves, like water or sound. The wavelengths humans can see range between red through yellow, green, blue, and purple with infrared and ultraviolet at the extreme ends. IR has a very subtle rolling wave, and UV has an extreme zigzag pattern to their wavelengths. Have you seen on TV when a car is in motion and the tires go forward, then seem to stand still before appearing to spin backwards? This is due to the frame rate of the film. Your device, unless you have super high DPI and refresh rate, is going to show it as bluish-purple. Top-end devices display it as a rapidly oscillating color shift through the whole spectrum.